Dosing math
Calculate units to dial for any vial size, water volume, and desired microgram dose.
Reconstitution
Step-by-step guidance on mixing lyophilized peptides safely with bacteriostatic water.
Product help
Find the right injection pens, cartridges, syringes, and storage cases from our store.
Calculate My Dose
Manual entry dosing calculator for reconstituted peptide vials.
Manual Dosing Calculator
Enter your vial details to get units to dial
Units to dial
37.5
0.375 mL on a U-100 scale
- Concentration
- 6.67 mg/mL
- Per unit
- 66.7 mcg
- Doses per vial
- 8.0
- Max single dose
- 4.00 mg (0.6 mL)
Assumes a U-100 scale (100 units = 1 mL). Educational use only — not medical advice.
Chat with Peptide Pen Pal
Ask anything about dosing, reconstitution, peptides, or products.
Peptide Pen Pal
Your friendly peptide concierge
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Ask me about dosing math, reconstitution, peptide info, or gear from the store.
Not medical advice — for educational purposes only.
Shop injection pens & accessories
Curated gear to make peptide research easier.
MetaTRIM V2 Reusable Metal Pen Kit – 3 Empty Cartridges and Pen Spacer Included
A durable, reusable metal pen with a weighted anodized-aluminum body and a smooth adjustment dial. Designed to fit standard 3 mL pen cartridges. What’s included 1 MetaTRIM V2 reusable metal pen 3 empty 3 mL glass cartridges in individually sealed packaging 1 3d printed pen spacer Product details Anodized-aluminum body with a matte finish 60-unit capacity Tactile click-style adjustment dial Magnified viewing window Compatible with standard 3 mL pen cartridges Available in Gold, Green, Blue, Purple, Red, White, Black, and Pink Care and storage Wipe the exterior with a soft cloth lightly dampened with 70% isopropyl alcohol. Do not immerse. Store in a cool, dry place and handle the internal mechanism with care. Important: The pen and included cartridges are empty. Needles and medication are not included. Inspect all sealed cartridge packaging before use. Ships from MetaTRIM Health in Madison, Mississippi. Free standard shipping is available on U.S. orders.
MetaTRIM Reusable 60-Unit Pen Kit with Case and 3 Empty Cartridges
A reusable 60-unit pen kit designed for convenient storage and transport. Available in Blue, Purple, Gray, and Green. What’s included 1 reusable 60-unit pen 1 hard-shell travel case 3 empty 3 mL glass cartridges in individually sealed packaging Product details Clear mechanical adjustment dial Reusable construction Case holds the pen, up to 3 compatible pen tips, and 1 spare cartridge Pen tips are not included Important: The pen and cartridges are empty. No medication is included. Inspect all sealed cartridge packaging before use. Ships from MetaTRIM Health in Madison, Mississippi. Free standard shipping is available on U.S. orders.
MetaTRIM Empty 3 mL Glass Pen Cartridges – 10 to 50 Pack
Empty standard-size glass cartridges for compatible reusable pen systems. Select a pack of 10, 20, 30, or 50. Product details 3 mL capacity Borosilicate glass Preinstalled rubber plungers Aluminum crimp tops with rubber septums Individually sealed packaging Available in 10-, 20-, 30-, and 50-count packs Compatibility Designed for pen systems that accept standard 3 mL cartridges. Confirm compatibility with your equipment before ordering. Important: Cartridges are supplied empty. No medication or other liquid is included. Inspect each seal and cartridge before use; do not use damaged packaging or glass. Orders are packed with protective cushioning and ship from MetaTRIM Health in Madison, Mississippi.
MetaTRIM Pen Tips – 31G × 6 mm or 32G × 4 mm, 100 Count
Individually packaged, single-use pen tips available in two sizes. Each box contains 100 tips. Available sizes 31G × 6 mm 32G × 4 mm Product details 100 tips per box Triple-bevel tip Silicone-coated needle Compatible with many standard screw-on pen systems Single use only Compatibility and safety Confirm compatibility with your pen system before ordering. Follow the instructions provided with your pen and dispose of used tips in an appropriate sharps container. Do not reuse. Important: Pens, cartridges, and medication are not included. Ships from MetaTRIM Health in Madison, Mississippi. Free standard shipping is available on U.S. orders.
MetaTRIM Research Station – Pen and Cartridge Organizer Case
A purpose-built organizer that combines storage, transport, and a removable preparation dock in one compact case. Designed and 3D printed by MetaTRIM Health in Mississippi. Capacity and organization Holds up to 4 reusable pens Holds 2 standard 3 mL vials and 2 standard 3 mL cartridges Top compartment organizes up to 12 pen needles, alcohol prep pads, and small accessories Integrated dual-cartridge dock with a central purge post Magnetic locking lid insert What’s included 1 MetaTRIM Research Station case 1 magnetic lid insert matching the selected insert and latch color Materials and finish Made with durable 3D-printed filament. Layer lines and slight surface variations are normal characteristics of the manufacturing process. Color shades may vary slightly between production batches. Custom colors Contact us if you need a color not shown. Made-to-order colors may add 1–2 business days to processing. Important: Pens, cartridges, vials, needles, syringes, preparation supplies, and medication shown in photographs are for demonstration only and are not included.
MetaTRIM Disposable 60-Unit Pen Bundle with Empty 3 mL Cartridges
MetaTRIM Disposable 60-Unit Pen Bundle A multi-pack of disposable 60-unit pen devices supplied with matching empty 3 mL glass cartridges. Available in 5-pack and 10-pack bundles. Bundle options 5-pack: 5 disposable pens and 5 empty 3 mL glass cartridges 10-pack: 10 disposable pens and 10 empty 3 mL glass cartridges Product details 60-unit adjustment scale Clear dose window Empty 3 mL glass cartridges with seal cap and rubber plunger Compatible pen tips are sold separately No medication or other injectable substance is included Confirm compatibility and follow all applicable instructions before use. Single-user product; do not share. Keep out of reach of children.
MetaTRIM Four-Cartridge Organizer with Purge Post
A compact organizer that keeps up to four standard 3 mL cartridges upright and protected. Designed and 3D printed by MetaTRIM Health in Mississippi. Features Four dedicated cartridge slots Central purge post Snap-lock cover Side cutouts for easier cartridge insertion and removal Compact design for storage or transport Specifications Compatibility: Standard 3 mL pen cartridges Capacity: Up to 4 cartridges Material: Durable 3D-printed PLA Available colors: Gold, Silk Rainbow, Purple, and White What’s included 1 four-cartridge organizer base with central purge post 1 snap-lock cover Layer lines and slight surface variations are normal characteristics of the 3D-printing process. Color shades may vary slightly between production batches. Important: Cartridges, pens, needles, preparation supplies, and medication shown in photographs are for demonstration only and are not included.